Fair Value Measurements (Details) (Fair value on a recurring basis, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Fair Value
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	$ 27
Total fair value assets and liabilities measured on recurring basis	(9,298)
Fair Value | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative assets	2,576
Derivative liabilities	(8,327)
Fair Value | Currency swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative liabilities	(3,756)
Fair Value | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	182
Level 1
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	27
Total fair value assets and liabilities measured on recurring basis	27
Level 2
Fair value assets and liabilities measured on recurring basis:
Total fair value assets and liabilities measured on recurring basis	(9,507)
Level 2 | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative assets	2,576
Derivative liabilities	(8,327)
Level 2 | Currency swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative liabilities	(3,756)
Level 3
Fair value assets and liabilities measured on recurring basis:
Total fair value assets and liabilities measured on recurring basis	182
Level 3 | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	$ 182